I do not know what or where #2 cable connects to inside of the seat frame.
You will need to remove enough of the seat cover to see what has failed or not working.
Below are parts and repair pics that may help.
Backrest, electrically operated L.H. Print
Fig. Description Qty. PS Part number
1 Backrest frame, left 1.00 30761826
CH -90445, REPL 1PCS 31306337, REPL 1PCS 39807152, REPL 1PCS 39807153.
Backrest frame, left 1.00 31363807
EXC (US), (CA)., CH 90446-
Backrest frame, left 1.00 31363808
(CA), (US)
2 Cable, easy entry 1.00 8613782
3 Hand lever, easy entry, left 1.00 8629973
Hand lever, easy entry, left 1.00 31307252
(CA), (US)
4 Bushing, easy entry 1.00 8629974
5 Shaft, easy entry 1.00 8629975
6 Spring, easy entry 1.00 8639121
7 Retainer 1.00 987177
8 Six point socket screw 1.00 986047
9 Washer 1.00 986497
10 Retainer, left 1.00 8629951
Retainer, right 1.00 8629954
11 Flange screw 1.00 989854
M6x40
12 Flange screw 1.00 985591
M6x12
13 Retainer 2.00 987177
14 Service kit 1.00 8639022
CH -22790
Service kit 1.00 31306349
Incl.39807152, 39807153, 39807154, 39807155., CH 22791-123009
Service kit 1.00 31377020
CH 123010-
15 Sensor, backrest 1.00 8639306
16 Magnet, backrest 1.00 8639307
17 Blind rivet 2.00 973881
3.2×8.2
18 Anchorage 1.00 8639024
19 Motor, backrest inclination 1.00 8613767
20 Screw 4.00 8621748
21 Lumbar support 1.00 31306493
22 Cover washer 1.00 31307793
Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89.
Cover washer 1.00 31307794
Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74.
23 Thumb wheel 1.00 39897612
Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89.
Thumb wheel 1.00 39897613
Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74.
24 Cover washer 1.00 39897615
Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89.
Cover washer 1.00 39897616
Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74.
25 Bushing 2.00 8686050
26 Flange screw 1.00 985026
M6x25
27 Protection 1.00 8621839
28 Flange screw 1.00 982763
M6x45
29 Head restraint, frame 0.00
Head restraint
Cross shaft 1.00 8613779
31 Support 1.00 8629623
32 Selector gate 1.00 39850749
CH -123057, Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89.
Selector gate 1.00 39850750
CH -123057, Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74.
Selector gate 1.00 39850749
CH 123058-, Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89., Variant code: EL02.
Selector gate 1.00 39850750
CH 123058-, Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74., Variant code: EL02.
Selector gate 1.00 39812921
CH 123058-, Interior code: 5D7E, 5D7H, 5D7M., Variant code: EL01., Interior code: 5X77, 5X79, 5X87, 5X89.
Selector gate 1.00 39812922
CH 123058-, Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74., Variant code: EL01.
33 Buffer 1.00 8639954
34 Six point socket screw 1.00 986161
ST4.8×13
35 Protecting casing 1.00 39850752
Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89.
Protecting casing 1.00 39850753
Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74.
36 Handle, left 1.00 39851845
CH -123000, Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89.
Handle, left 1.00 39811525
CH 123001-., Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89.
Handle, left 1.00 39851846
CH -123000, Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74.
Handle, left 1.00 39811526
CH 123001-., Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74.
37 Six point socket screw 1.00 986106
ST3.5×9.5
38 Frame 1.00 8629972
39 Frame 1.00 39897618
Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89.
Frame 1.00 39897806
Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74.
40 Switch, charcoal 1.00 8629619
Interior code: 5D7E, 5D7H, 5D7M., Interior code: 5X77, 5X79, 5X87, 5X89.
Switch, quartz 1.00 30764851
Interior code: 5X71, 5X78, 5X81, 5X84., Interior code: 5D7G, 5E74.
